linux-kernel - [PATCH 4.14 069/159] perf help: Fix a bug during strstart() conversion

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Date:   Fri, 23 Feb 2018 19:26:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Taeung Song <treeze.taeung@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Sihyeon Jang <uneedsihyeon@...il.com>, kernel-team@....com,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 069/159] perf help: Fix a bug during strstart() conversion

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <namhyung@...nel.org>


[ Upstream commit af98f2273fd0af31ce327cd1406b67c7be0b6734 ]

The commit 8e99b6d4533c changed prefixcmp() to strstart() but missed to
change the return value in some place.  It makes perf help print
annoying output even for sane config items like below:

  $ perf help
  '.root': unsupported man viewer sub key.
  ...

Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Tested-by: Taeung Song <treeze.taeung@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Sihyeon Jang <uneedsihyeon@...il.com>
Cc: kernel-team@....com
Link: http://lkml.kernel.org/r/20171114001542.GA16464@sejong
Fixes: 8e99b6d4533c ("tools include: Adopt strstarts() from the kernel")
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/perf/builtin-help.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -284,7 +284,7 @@ static int perf_help_config(const char *
 		add_man_viewer(value);
 		return 0;
 	}
-	if (!strstarts(var, "man."))
+	if (strstarts(var, "man."))
 		return add_man_viewer_info(var, value);
 
 	return 0;
@@ -314,7 +314,7 @@ static const char *cmd_to_page(const cha
 
 	if (!perf_cmd)
 		return "perf";
-	else if (!strstarts(perf_cmd, "perf"))
+	else if (strstarts(perf_cmd, "perf"))
 		return perf_cmd;
 
 	return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;